I am planning to buy a Trek 820 bike. Where is the place that I can get it for the cheapest?

I live in Friendswood, Texas. I want to buy a Trek 820 bicycle. Bike barn on Bay Area where I live, sells it for 300.00$. I was wondering if there was maybe a cheaper place to get it. Serious Question, Serious Answer please and thank you.

By the way..I'm only 13. That's why I need the cheapest price.
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